Discounts never end too well.
Resentments may lead to the poor performance, loss of motivation, feeling stressed in a long run whenever you are asked to see the said clients, who expected "discounts". Once I start to see certain clients being cheap, whilst others are paying the full price, I begin to see them as cheaters, who get knocked down price off prostitutes, not very nice.
After all, it has to be non-strings, they come and go and they go to other ladies (they may be paying more than he does pay you), why should I subsidise their punts? It doesn't make any sense. If they can't afford it, simply cut it down. They have money, but as mySecret says, they are "tight" expecting ladies to take less money based on their excuse that they are using your service more often. But it has risks described as above.